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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bd8dcffdc1d066527c60f1929d08335865bb4a1ae08267f49ae924756ad0016' 
  AND token = 'JSQbXuCElv/gvi+suSQRJPwya6a7DbKP4CydlG2u9rw=' 
  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"
    }
  }
}