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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '846d5d99b50348f52fc2c2a04e82c768e1e3479f3a675ea176fa97de48de3ab6' 
  AND token = 'b++K7+aC9y6EPfUmt4Q9yHUbPp1psvf18eusr2E1ftQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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