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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '375de4d844e5cd27736c1f0e11fe7e3d32e01f3a34c8592ec5bf3caf3af68a21' 
  AND token = '/PFet6lsT+iactliZqrSa7Zr2drooGBazUNB7s1NICY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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