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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f95e0423f58b3603b3d02f26830067e2d30abd1815db55d2a4f41e464fca259' 
  AND token = 'EjNEJO2JSK4vq4lgZjufIdNTashy0/5lUKgtxy9yikw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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