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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e056bcd393d4d6c3de1499d3979ac20c2f8bba1a332997e4db88ad1bbef23201' 
  AND token = 'zqQ8kAlL0R3PLCuDA19U4AV3SQxUCu2VB23uiXclIfQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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