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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '947a5b56a0e9bbbdc65d045c04eb86abfe79a9bfccf4546c2949983848d39946' 
  AND token = 'r3gOdEo4Vxcj+nLktz4ixQWm/EXiDRNW4zDJZ5od3RE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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