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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c530dc163476be5cf7bc314ae03104b16686a226c03c0d9dd9c067e7400d6f8a' 
  AND token = 'PRG7A4PObT7EVjG7J5vZ1kZHYeVH9PMS27Tvq3duHu4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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