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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bccb9fdaf6930c8326cbdbdf0eb8af13bd70c55643d3cbe4d306d15de574bfc6' 
  AND token = 'HwGLo3STY9V5tq1bWJ9Uhb6IOCjlrNbmxDZl/qpwQcg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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