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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3507c127621a15c49b82523d465a13ad88793f6505a10471b7e81b75a11f22b' 
  AND token = 'qON/TiwpifDY9lFT5yA9/2dr99qfuWDWVOWeQVR4tnU=' 
  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"
    }
  }
}