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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29bbc3feca0aac883f3f38423946f3e08e06977f53ecf24f2201f1f23c59adf5' 
  AND token = '3EBVqoiTrTCzYMBB9uLECAGzelfS32abt8xcygXx/Mk=' 
  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"
    }
  }
}