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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d795edb25d590ae99bd62f2335f35501596936b2e798735e6c312e4c7f0c194' 
  AND token = 'AK1GSCKQ32yKv7lhPn0O24k8sn/ZuE3pPzro+c9fFNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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