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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39e0d8fd938c1d235db7009b77904fc17cbc2be3924fb33ade252a689ea6675b' 
  AND token = 'FemgbZqdjtFwuc8p7Yzg0xH0zuApHQ8qjP9Hvn9efyg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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