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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90c49d0b86f5491cb235affe7c8542a6ce3acf432e2b6c59f77607d28b39b7b2' 
  AND token = 'y/dBsZ4AjPz14WirP3f8D0Efijg/SHxB2mqYnMHucjQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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