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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '027dfc36d31ec4238cb9e0127de33b7974b432ca82a7f0f9842c8de6eda03986' 
  AND token = 'h72M0L/3J4VPBc9tm8YRiX6JhVOitx1RIVi3mv+fCzY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00067

JSON explain

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