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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29175edb4c9a3c5e95d3f95309ebc01209daeabeab6c2417bcc767e11e3941bb' 
  AND token = 'fQ2TQhu1AFnGQyDWIelbU/BL5L3AF7TXF4FRlpS6yAU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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