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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aeb6b7f034d82722da48dc9393e1c2507f7f78183ea63d7914f7c77652a32737' 
  AND token = 'R0/X5gw18oSZLoNLMUfnFmWYpGJL0YE1WyIU06B4gsU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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