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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e9940e40997ede71bc6f04cff7ebd700b4daebbdb5053f93ee44d58726704f3' 
  AND token = 'XBCUtS34t5MounxwCZKmQeCmInS+DNRg9ZPen0GyMmw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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