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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02be9d0b299a9c8bc24a3dcaa15bb99e00dc8d501f706cb0dfb68e4740676cb8' 
  AND token = 'bE82uTKhJEaT4q8pM6TNMNUlMLPpPBa7BFO56IxpbQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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