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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ea3fdbbd4a060f665577db2a7329e7965c078c9d30bcd12cfc205b4c0e316c8' 
  AND token = '/EaxM9zOfDmXdLsHkVQ+D+QM1Xk0ws5KV0XV5+xf0hA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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