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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fa2538c6c9fe395cb99a8276a2fd7b0ce69ae096f2c6a8173b464bedf8a0789' 
  AND token = '3iu/V/uyQORlqyD6ysBUDK6eotgHJU4P500KCaexEms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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