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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9301f10f9fa36c8527058e96278ed83739d1b0412666441a507e9538209b1399' 
  AND token = '+m+YzkvqVBrz2lEJkk9WBiKrfcmxtDPW0H0NPyT7H0w=' 
  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"
    }
  }
}