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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33fb62af4bd056edbce7894944144ce4bc16ef5c7129d2204c4aecf2dc3f1207' 
  AND token = 'mKMWzj0o98Xc/Z0sP2kW53c14+vHudcruP/2+yQYvuI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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