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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ee2da268562c010ded7fbffc6b69e101481372a44e8236db9e136d2c155318f' 
  AND token = 'mfp6rSNBxWXNhXJQjnbr4WCYAIf6oT67vN4dx7/AMuQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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