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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9d8897308f8ff3d22c212457534654127d898448fb000ecce5bd5ea0532b8a4' 
  AND token = 'vbcU5b6I36IfurPNKDxo+AQM9curuJRpeiLc1q1rRZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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