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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca87ba337c4b14c5dc04bb6d400c8c22c1a975c354f3fb42044f8ef5f669bbf4' 
  AND token = 'k2gcKNdwFnBLtp5DtM+e9O+2bi0kukPghgik7b+ryfY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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