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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3776b0c279bea0a7ed39acb37127731c10427d1adf8139b51c87fe89c335cebb' 
  AND token = '2I0CARl9twNU88jGPDS1Y0f1wvyaaeZVP08esMqYBFE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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