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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f64097b86bfe063b1da5e48990018620bfd4a2cd1e27bf56db2835d69b3d31a' 
  AND token = 'gKLt4XETuz3i4PG6xj422kbQJp1FYKRu0piVlx0lwcE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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