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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd15d3d4ff04c4f216f6416ef5733a99ed7b91b9a1674ff9d23cf08902c122d04' 
  AND token = 'jMgrHfXyNP05YSbgDDLZ41f5mfzLPuG6a31UjrOszSE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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