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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '366bc7ff5b1bd7449d0c46771e527e09af158f1b83a82c89d5e110fbf128f516' 
  AND token = 'OAlZHKjrqYi8whusyqwb+LintM4JiC77r20o1EoO70o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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