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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48df0bd6e372b166c6bb826549a667f594392e212ca0c546b0b38aa0c0d3350a' 
  AND token = 'ACM0zpT2Vts4BlcjpJpTGYkZErNC31h71J5lxz2+rlE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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