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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77b418f37a6c645712ae1528462ba845e540aa727d9163f1547ca299b16832f5' 
  AND token = 'mjn9x0q1O1mnb37I7TZqbOuBjzFPW8ZZWq8NBl5YkiM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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