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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49d02f125cfcb27024f54546bb39b3183b8dff61aee10fb498df4293866f6562' 
  AND token = 'HiXIYPsk8ifsHIiZ3/x/QL6AwZXy1wnmR6kt+qXVmAw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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