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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '837c1de9aea8dcb3f23d54ef5c8c2924e8f23c8a33a552a1f41b90088ceac081' 
  AND token = '2T8EYluTQre/2grK3iAU5m66nCjljjPi9JCQCOTbWY8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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