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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fc4910fa26c49386332d60c511913ad7bf6d1b5a70d6024a323fa91633b9a5f' 
  AND token = 'r951iyT4919V776/cR0mTjq3LUgSbAugs2S6UEh2xdg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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