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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32e36eac1e3cf1367d56eff3badfcd2df04e3f4fcdc744fe99029a9938f5b0a1' 
  AND token = 'ngjOzzOUHWBbX7Ggn4geYYbl3pM0HFEeSj0bEU1J2DE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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