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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '467f5b578ed7b38e8bf90505f2f57642f032f8001ee53a3f84c4541f73775763' 
  AND token = '3AzNbwhu7Zh3FXT6dWodbk0qjyVjohZ+8wWeIQQVljY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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