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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7b60405cf34ed8a2d7430c093a11f3bb319c99e08c10e95a6808d54433283a7' 
  AND token = 'tJnQWB5TXUwAC4zvlbyGVEKrT0dunFQsl4wAQeM24Fc=' 
  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"
    }
  }
}