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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d1e06ddf57944036ae0bc6541a6c861b905ca0f6b2894ce9aaacd94150f82b3' 
  AND token = 'pG4R+qy5KfTb1DNE0pk8a+H91nFJTVsklC6hX6//02g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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