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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9c1b68e38be85910b3a99059ff52c0e28d235b52c204f4269278a936d4d2fae' 
  AND token = '03Ar1wczPMdjtp4Ke71cb0J/mZ1vcO+6Zp86dyqitsk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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