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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5046c3a522e18b51e8aaa4680a65c16b4d469047b4fda890bbff1a20b096ab06' 
  AND token = 'QlDsLkIylFZ2TqyRK3nL7TT2iTz+jvcxppN2sFbvsXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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