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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5369797ad07643701d584f3d39678e2accb7056bf77c8f5d09df4a7d0ceca86a' 
  AND token = 'deH4Qi7VuuaP2kgkrZ/v3QsvRdRzY9QP4gzeeCkycCg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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