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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '614a2e36ac6f0dccf86ec3ca71b4de5536dfccb2b3148c00ba57b6b935afbb78' 
  AND token = 'lYgahd8HPPZIhhpzFX0eWsfY58u/yHAyb0z0Ba9Kpxo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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