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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7c6d343636ef2691d97abcf17f4455d1a40d89cf5651d701e92e6ca0dbc3363' 
  AND token = '3wxXeXC55VVVOFZAPKsDj20Na7pOepTJ7rfhcm548MM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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