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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd30658a4e37181b83be8b8e5dce9f6cd9ed53841978d59f73a06254d1e0935cb' 
  AND token = 'ras/xlK031VU0TCevghHFNbDANOd9+I31d5Cm+ncq7Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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