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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '597c6bef39f7af9d753b979f74af99fe34e482587036649723eb9f27c739eeee' 
  AND token = '/2/xnID6Q2QyhbfdBFKG8ZotvkTV6Th3QJtlwjzdsQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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