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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '644348c27678e5eade850a7738d085a9ef7dd5e7276dca95476ae289f4213a9e' 
  AND token = 'fp4+baOvUjk7uMj7sVFtS7Q68L8dvDSRVZVqDyPfPr4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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