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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cde10a6f0608ba2cf1c60009888e431418364d4f42f8c90b8a827bf3917a906' 
  AND token = 'KI4btD23EzvlU+z0faUv4RRdLA476OwBTRtL6404ymI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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