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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8024240ac035aec156c5355370c5fbd628c4505714e0cd4fa077f4bba7a17346' 
  AND token = 'matIQdwV/01zznSM9ZMLGklG7GF2ukDN27CNxc+3nXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}